package com.fan.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * sqlSessionFactory-- >sqlSession
 *@author Fan
 */
public class MybatisUtils {
   private static SqlSessionFactory sqlSessionFactory;
   static {
      try {
         //使用mybatis的第一步获取sqlsessionfactory对象
         String resource = "mybatis-config.xml";
         InputStream inputStream = Resources.getResourceAsStream(resource);
         sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
   //有工厂 sqlSessionFactory,我们就可以从中获得sqlsession的实例了.

   public static SqlSession getSqlSession() {
      // sqlSession完全包含了面向数据库执行SQL命令所需的所有方法。
      return sqlSessionFactory.openSession(true);
   }
}
